Airplane



FIG. 1 is a top plan view of an airplane showing our new design;

FIG. 2 is a left side elevation view thereof of which the right side is a mirror image thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof; and,

FIG. 5 is a bottom view thereof. 

The ornamental design for an airplane, as shown and described. 